Dental casting machine



Aug. m, w23. www@ S'. L JEFFERIES DENTAL CASTING MACHINE Filed om.` 15A. 1921 2 sheets-sheet 1 Passati aug. it., ieee.

vSAMUEL LIONEL JEFFERIES, OF GFFNEY, SOUTH CAROLINA.

DENTAL CASTING 'JIACHINE.

Application tiled October 15, 1921.

To all whom it may concern.'

Be 1t known that 1, SAMUEL LIONEL JEE- EEniEs, a citizen of the United States, and

a resident of Gaffney, in the county ofl Cherokee and State of South Carolina, have invented certain new and useful 1mprovemcnts in Dental Casting Machines, of which the following is a specification.

My invention relates to a dental casting machine.

The object of the invention is to provide a machine ofthe above charac-ter by which the fusing of gold, porcelain, or like material from which teeth are formed and the casting of a tooth may be accomplished in one operation.

It is also an object of the inventionrthat the machine be adapted to be easily operated.

It is a further object of the invention that the machine be extremely simple in construction and inexpensive to manufacture.

Other objects and advantages of the invention will hereinafter appear.

' The invention is illustrated by way of example in the accompanying` drawings, in which, Y

Figure 1 is a vertical sectional view eX- emplifying the embodiment of the present invention.

Figure 2 is a top plan viewof the Crucible table. Y

Figure 3 is a detailed view illustrating a modified form for lifting and lowering of the Crucible table. l

Figure L1 is a view in side elevation of a Ymodified form of the dental machine and showing the supporting bench or table in section. Y

Figure 5 is a view similar to Figure 4l; and` showing a still further modification of the dental machine.

Figure 6 is adetailed viewA illustrating a modified form for compressing the fused material in the mold.

Referring to the `drawings in detail and particularly to Figures 1 and 2, 1 0 indicates generally a work bench or the like and 11 .a floor therebeneath. Upon the work bench 10 there is provided a plurality of vertical posts 12 which support a plate 13,said posts being preferably formed by bolt and `telescoping, sleeve as, shown, said bolts being adapted to .solidly secure the plate 13 to thev bench 10; and the plate 13 is preferably rectangular inshape. Theplate 13 land benen Serial No. 508,011.

10 are provided with registering openings 14 through which there extends the forks or arms 15, said forks terminating at their lower ends in a shank 16, the free end `of which is bifurcated and having pivoted between bifurcations one end of a ball crank lever 17 by means of a rivet or the like, as

at 18. The bell crank lever 17 is fulcrumed between a pair of standards 19 by the means 65 of a pin asv at 20, the'standards 19 being; formed with a base plate 21 which is secured to the Hoor by means of nails or the like as indicated at 22. Upon the other end of the bell crank lever 1'? there is provided a foot 70 pedal 22 by which the same may be depressed.

'lhe free ends of the forks 15 are connected by a plate E23, said plate being formed witha central circular opening 23 in which 75 there is disposed and secureda grid 24, said grid consisting of the radial Vplates 24', which extend from the periphery of the opening 23.

Upon the plate 23 there is secured an as- 80 bestes sheet generally designated by the reference numeral 25, said sheet having` a central opening'adapted to register with the opening 23 of the plate-23 and being secured in position by means: of rivets or the likeas indicated at 26. Within the opening A 23 of the plate 23 there is fitted a cylindrical Crucible 27 in which there is provided a mold 2S, said mold having` formed therein a vcasting cavity 29 which communicates `with the upper surface of the mold through the orifice 30. Also the upper surface of the mold is dished as shown in Figure 1.

Upon the plate 13 there is positioneda pair of posts 31 which are preferably squared in cross section and each postterminating in its upper end in a reduced threaded portion 32. The posts 31 have each arranged longitudinally thereof a plurality of openings 33 which are adapted for receiving the pins 311, the purpose of the pins being to provide means whereby the table 23 may be held in different positions. rllhe posts 31 also support a plate 35, said plate being secured in position by nuts 36 carried by the ends of the posts 31.` Beneath t-he plate 35 there is disposed a cap 37 which is Vadapted to fit upon the cylindrical Crucible 27, said cap having formed upon its upper face a nipple 38 which extends'upwardly through the plate 35 and adapted to 'permit4 vertical movement of the 'cap 37, At

aniy7 suitable 'and convenient point a tank 39 is positioned adapted to hold a supply of compressed air and from this tank there is eX- tended a pipe40 which extends through the i 4nipple 33 of the plate 37 and carries a. valve 41 which is adapted to be operated for open- Ving the pipe 40 through the handle 41 and link 39' so that air may escape therethrough into the crucible 27 upon the upward movement of the cap 37 and normally held closed by the spring 49. Also the pipe 40 mayr have interposed therein a valve 43 by which the compressedy air from the tank 39 may be controlled.V Y

f Between the forks 15 there is supported a table 44 upon which a burner 45 may be seated for applying its flame beneath the moldV )28. Also the burner may be connected jwith a fuel supply hose as at 46 which may extend through an opening` 44 in the table 44 and thus permit theburner to be raised and lowered with the crucible 27- 'f ln the operation of the present casting machine, Yassuming that it was intended to cast a tooth of a determined sizev and shape then the lproper mold 28 is located and placed in the crucible 27 and the proper amount of porcelain, gold or the like is placed upon the mold. VThe burner is placed in position and after the metal or porcelain has melted on the top of the mold then further pressure is exerted upon the foot pedal 22 to bring the crucible beneath the cap 37 and force the same upwardly whereupon the valve 41 is operated to per- Y mitair pressure to be applied upon the Y l and thus cause a solid tooth 40 be'cas't.

i can be likewise removed, that is after the saine has. been properly cooled. f

Referring toV Figure 37 47 indicates a bell crank lever similar to the lever 17 indicated fin Figure 1, which in this instance7 however, is fulcrumedVA or pivoted as at 48 to a downwardly extending bar 49. Also the lever is formed with a /knurled handle 5G at its other end so that the same may be handoperated for moving upward and downward the crucible table support generally indicated. by the referenceV numeral 51. Numeral'52 indicatesthe laboratory table similar to that indicated by the reference numeral 10 in Figure 1.

Referring to Figure 4 in which a modified means is shown for raising and lowering the cruciblev27 it lwill be seen that each of the posts 31 'rotatably support a pinion 53 which is adapted to mesh witha rack 54 extending downwardly from eachend of the crucible table 23. Uponone of the posts 31 there is pivoted a handle 55 which has projected therefrom adjacent its upper end a finger 5G and the `free end of the finger being disposed in between pair of adjacent teeth of the associated cog wheel 53. As is obvious by thisarrangement when itis desired to move the crucible table upwardly it is only necessary to dra-w downwardly upon the handle 55 and when it is desired to move the crucible table downwardly then this operation is merely reversed.

Referring to Figure 5 of the drawings the construction vshown is substantially'the same as illust-rated in Figure 4 andy like reference numerals refer to similar parts. `In this instance, however,'one of the cog wheels 53 is formed upon a large circular plate member indi-cated bythe reference numeral 56 which has a handle as'indicated at 57 eX- tending at right angles thereto andy by which the apparatus or machine may be manipulated.

Referring to Figure 6, the purpose of this illustration is to show a modiiiedmeans for forcing thel fused metal or porcelain into the mold. In this instance the numeral V58 indicates a plate similar to -the plate 35 shown in, Figure 1 which is supported in the same manner and has formed upon the lower face thereof a hemi-spherical shaped cup 59. This cup Vis in alinement with the crucible 60 and it is supported by the plate or table 23 described in F igure. 1. ,The crucible 60 has disposed therein its mold 61 in which is formed the cavity for molding a tooth or the like yand which communicates with the upper surface of the mold through anorificc as shown in Figure 1. In this instance the cup 59 is filled with asbestos,

wet paper or other material similar in character and upon the upward movement of the crucible. table this wet paper or the like will engage the crucible and press downwardly upon the fused metal upon the upper surface of the mold 61 and force the same into` the cavity therein for forming a solid tooth casting.

While I have herein shown and described the preferred -form and likewise modified forms of my invention, I wish it to be understood that I amv aware of the fact that Y the gene-ral arrangement, combination and construction of vparts may be changed by those skilled in the art without departing from the spiritV of my invention as indicated by the appended claims. y

VVhatI claim is: v

1. A ldental casting machine of the characterrdescribed, comprising a table, means for manually raising and lowering said table, a crucible supported by the table, and adjustable means for supporting said table in a raised position.

Vlfiesse f 2. A dental casting machine of the character described, ,comprising estable, means Vi'or manually raising end lowering said table, a Crucible supported byl seidteble, a cap supported above the table 'adapted to fit upon the crucible when saidv table Iis moved upwardly to bring the Crucible into engagement with said cap, a, source 'of compressed air supply, and means whereby compressed air will befautomatically permitted to enter the cap upon the table being raised predetermined degree.

3.1i dental casting macliine'oi'f the character described, comprising e table, means for manually raising and lowering` 'said table, a vCrucible supported by said table, a cap supportedl above they trible adaptedto uoon the crucible when f said table dis L., 1 v moved upwardly to brin` the Crucible into engagement with seid cap,r said capr eing adapted; to Vmovey upwardly, and means whereby the upward movement of the cap a predetermined degree' willcause compressed air to enter the interior of said cap.

acter described, comprising ay table, means for manually raising and lowering said table, a Crucible supp'ortedfby the table, a plurality of stationary ,post-s extending above said table, a' cap supported bysaid 4f.' i dentalcasting machine of the char'.

posts, and means carried by said postsl whereby the rheight 0In the tableV may be adjusted. 1-

5. A dental casting machine of the character described, comprising' a. table, means for manually f raising and lowering said table, a Crucible supported-by the table, a plurality of stationary posts extending above said table, a 'cap supported by said posts, and pin means adaptedtorbe adjustaibly raised upon said post izor supporting the table in e. raised position,

6. A dental casting` machine of the character described, comprisingl a table, e foot lever for raisin@- and lowering' said table. M L

cruciblesupporl'ed by the table, end means for adjustably supporting saidA table inA a-v reised position. v

7, A dental casting machine, comprising stationary table, a plurality `ofrods 'eX- tendingY upwardly through" guide openings in seid ,tablea foot' lever oriraisingand.

lowering said rods, efcruciblefftable sup-r ported by said' rods, a crucible cap supported above seid `table, and means whereby a burner may be 'supported' upon the 'first naniedrtable vtoapply a hesitbeneath the Crucible table .when said crucibletableris in a raised position.

sAMUELfLioNEL .inrrnnins y 

